Helmet cooler



FIG. 1 is a top plan view of the helmet cooler showing my new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a left side elevational view thereof, the opposite side being a mirror image;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is an exploded perspective view thereof. 

The ornamental design for a helmet cooler, as shown and described. 